AdventOfCode/2020/day17.py

49 lines
1.4 KiB
Python

import numpy as np
with open('input17', 'r') as file:
init_state = np.array([[c == '#' for c in l.strip()] for l in file.readlines()])
def sim_step3d(state):
new_state = set()
neighbours = {}
for (x,y,z) in state:
for i in (-1,0,1):
for j in (-1,0,1):
for k in (-1,0,1):
neighbours[(x+i,y+j,z+k)] = neighbours.get((x+i,y+j,z+k), 0) + 1
for loc, n in neighbours.items():
if loc in state:
if n in (3,4): # We added an off-by-one by counting active cubes as their own neighbour for simplicity
new_state.add(loc)
elif n == 3:
new_state.add(loc)
return new_state
state = {(x,y,0) for (x, y), v in np.ndenumerate(init_state) if v}
for i in range(6):
state = sim_step3d(state)
print(f'Part 1: {len(state)}')
def sim_step4d(state):
new_state = set()
neighbours = {}
for (x,y,z,u) in state:
for i in (-1,0,1):
for j in (-1,0,1):
for k in (-1,0,1):
for l in (-1,0,1):
neighbours[(x+i,y+j,z+k,u+l)] = neighbours.get((x+i,y+j,z+k,u+l), 0) + 1
for loc, n in neighbours.items():
if loc in state:
if n in (3,4): # We added an off-by-one by counting active cubes as their own neighbour for simplicity
new_state.add(loc)
elif n == 3:
new_state.add(loc)
return new_state
state = {(x,y,0,0) for (x, y), v in np.ndenumerate(init_state) if v}
for i in range(6):
state = sim_step4d(state)
print(f'Part 2: {len(state)}')